A "remote input file" is located on a data server other than the project server.
Previously these could be specified only in the input template,
which was of limited utility.
Add new ways of specifying remote input files:
1) in the create_work program, a remote input file can be specified
with command-line args
--remote_file name URL nbytes MD5
or by the same syntax in stdin when creating multiple jobs
2) add a variant of create_work() called create_work2(),
which takes a vector of INFILE_DESC structures that can specify
either local or remote files
David Anderson